From patchwork Tue May 5 05:21:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Al Viro X-Patchwork-Id: 6335411 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 188E39F32B for ; Tue, 5 May 2015 05:44:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4A5D5201F4 for ; Tue, 5 May 2015 05:44:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 66049202E6 for ; Tue, 5 May 2015 05:44:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755581AbbEEFW6 (ORCPT ); Tue, 5 May 2015 01:22:58 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:39628 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755562AbbEEFW4 (ORCPT ); Tue, 5 May 2015 01:22:56 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.76 #1 (Red Hat Linux)) id 1YpVJl-0001IU-U4; Tue, 05 May 2015 05:22:53 +0000 From: Al Viro To: Linus Torvalds Cc: Neil Brown , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 05/79] libfs: simple_follow_link() Date: Tue, 5 May 2015 06:21:39 +0100 Message-Id: <1430803373-4948-5-git-send-email-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <20150505052205.GS889@ZenIV.linux.org.uk> References: <20150505052205.GS889@ZenIV.linux.org.uk> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Al Viro let "fast" symlinks store the pointer to the body into ->i_link and use simple_follow_link for ->follow_link() Signed-off-by: Al Viro Reviewed-by: Jan Kara --- fs/inode.c | 1 + fs/libfs.c | 13 +++++++++++++ include/linux/fs.h | 3 +++ 3 files changed, 17 insertions(+) diff --git a/fs/inode.c b/fs/inode.c index ea37cd1..952fb48 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -152,6 +152,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) inode->i_pipe = NULL; inode->i_bdev = NULL; inode->i_cdev = NULL; + inode->i_link = NULL; inode->i_rdev = 0; inode->dirtied_when = 0; diff --git a/fs/libfs.c b/fs/libfs.c index cb1fb4b..72e4e01 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -1093,3 +1093,16 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp, return -EINVAL; } EXPORT_SYMBOL(simple_nosetlease); + +void *simple_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + nd_set_link(nd, d_inode(dentry)->i_link); + return NULL; +} +EXPORT_SYMBOL(simple_follow_link); + +const struct inode_operations simple_symlink_inode_operations = { + .follow_link = simple_follow_link, + .readlink = generic_readlink +}; +EXPORT_SYMBOL(simple_symlink_inode_operations); diff --git a/include/linux/fs.h b/include/linux/fs.h index 35ec87e..0ac758f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -656,6 +656,7 @@ struct inode { struct pipe_inode_info *i_pipe; struct block_device *i_bdev; struct cdev *i_cdev; + char *i_link; }; __u32 i_generation; @@ -2721,6 +2722,8 @@ void __inode_sub_bytes(struct inode *inode, loff_t bytes); void inode_sub_bytes(struct inode *inode, loff_t bytes); loff_t inode_get_bytes(struct inode *inode); void inode_set_bytes(struct inode *inode, loff_t bytes); +void *simple_follow_link(struct dentry *, struct nameidata *); +extern const struct inode_operations simple_symlink_inode_operations; extern int iterate_dir(struct file *, struct dir_context *);